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Recognised as Colour

#1F63FB

  • #1F63FB
  • Blue
  • Dark
  • Nearest: Medium slateblue

#1F63FB is a blue with RGB values 31, 99, 251 and HSL 221°, 96%, 55%. It is a dark colour, so white text on it reaches 5:1 contrast (AA for normal text). The nearest named colour is Medium slateblue.

Colour values

#1F63FB#1F63FB
HEX#1F63FB
RGBrgb(31, 99, 251)
RGB (0–1)0.1216, 0.3882, 0.9843
RGB percentages12.2%, 38.8%, 98.4%
HSLhsl(221.5, 96.5%, 55.3%)
HSV / HSBhsv(221.5, 87.6%, 98.4%)
CMYK87.6%, 60.6%, 0%, 1.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,057,211
CSS custom property--colour: #1F63FB;

Brightness & contrast

Relative luminance0.1618WCAG 2.x, 0 is black and 1 is white
Perceived brightness115 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 4.96:1
Contrast with white4.96:1WCAG normal text: AA
Contrast with black4.24:1WCAG normal text: Fail
Greyscale equivalent#606060
Inverted#E09C04

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#007AFFno red cones; affects about 1% of men; ΔE 16.9 from the original
Deuteranopia#0066F8no green cones; the most common form, about 1% of men; ΔE 4.4 from the original
Tritanopia#008BA6no blue cones; rare, and affects men and women equally; ΔE 82.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.96:1WCAG large text: AAA
Contrast with black, large text4.24:1WCAG large text: AA

Named colours

Medium slateblue · ΔE 16.9Royal blue · ΔE 18.7Slate blue · ΔE 23.2Medium purple · ΔE 31.8Dodgerblue · ΔE 34.1Blue violet · ΔE 34.2
Nearest named CSS colourMedium slateblue (#7B68EE)ΔE 16.9, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FBB71F
Analogous#1FD1FB, #491FFB
Triadic#FB1F63, #63FB1F
Split complementary#FB491F, #D1FB1F
Tetradic#FB1FD1, #FBB71F, #1FFB49

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#E7EFFF
Lighter +30%#B5CCFE
Lighter +20%#83A9FD
Lighter +10%#5186FC
Darker −10%#0449E3
Darker −20%#0339B1
Darker −30%#02297F
Darker −40%#01194D
More saturated +25%#1B61FF
Less saturated −25%#3C6EDE

Channel breakdown

R31
G99
B251
Red31 (12.2%)
Green99 (38.8%)
Blue251 (98.4%)
Hue221.45°
Saturation (HSL)96.49%
Lightness55.29%
Dominant channelBlue
Hex per channelR 1F · G 63 · B FB

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Every value on this page was computed from “1f63fb” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.